Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4983c812d966291…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 05:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6bd023912400d52f224ff4a506a35362 SHA-1: e072239db4cca9a600a9124f7755a62c6dcb5e9c SHA-256: c4983c812d966291a4a3ae9e2c8d38f734312f2716c1ffcb0e37f925db14b3ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://tsutae-f.com/js/upload/files/mewedamowixe.pdf In PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d6ef66db0---52319835370.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16079f117c5287---41861487563.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/mewurefuzotoba.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/jibogexifotot.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/zagijizabofumizuseb.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad91ef1e0b1---vibeber.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/3894897296.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608f27ee1da8b---76140244535.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/kivevojagavebesalo.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/0def83c27afb7a3f4c735ef1decb2989/xoturofasobe.pdfIn PDF document text
    • https://dacola.com/upload/files/39964134563.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/nujuwesin.pdfIn PDF document text
    • http://blatt-gruen.ch/files/gifetetukov.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///96155862412.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b697cd0845---vodufavifekekapuz.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebd2c21f01---58399207640.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/73022042416.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/f284a2e1e32ad3737a463bef67a3d38b/vabawipowujudajijajenij.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/88429698792.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/vapowadorufanajepote.pdfIn PDF document text
    • http://baove247.org/upload/files/wofuninotiwejifixos.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/rodesaxivekesevonit.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/lutovegasav.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/7570448452.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/kumegemupotoxane.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/70310623939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=multiplying+a+whole+number+by+a+fraction+word+problems+worksheetsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 17348 bytes
SHA-256: 7fb28b85e7473d0235c6433b63f1a90d739d3c8d2fe521993ba86f0975cb0b1b
font_01_sfnt_off000108d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D4 11592 bytes
SHA-256: 17a12e47335a75be9bf9bc47ae2a859644b07e2826bbab0d176ab4b94152b9bd
font_02_sfnt_off000123d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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